Springer Iranian Journal of Science 2731-8095 35 3 2011 09 16 Atom-Photon Thermal Entanglement in Nonlinear Jaynes-Cummings Models 217 222 2145 10.22099/ijsts.2011.2145 EN A. Keshavarz Physics Department, College of Sciences, Shiraz University, Shiraz 71454, Iran M. M. Golshan Physics Department, College of Sciences, Shiraz University, Shiraz 71454, Iran Journal Article 2011 04 06 In this work we investigate the thermal entanglement between two-level atoms and photons in a nonlinear cavity. We consider intensity-dependent couplings and calculate the negativity, as a measure of atom-photon<br />entanglement. The cavity is assumed to be at a temperature T, so that all number of photons, and at the same time, both atomic states, with definite probabilities, are present. We then demonstrate a condition under which the intensity-dependent coupling leads to entanglement. It is also shown that, as in the case of linear Jaynes- Cummings model, the thermal states of atoms and photons are never separable. https://ijsts.shirazu.ac.ir/article_2145_23f4a1b04ffa80c9e5a9e36cbe6e2175.pdf